[PATCH v4 2/2] mwifiex: add cfg80211 testmode support

[Amitkumar Karwar <akarwar@marvell.com>]

From: Xinming Hu <huxm@marvell.com>

This patch adds cfg80211 testmode support so that userspace tools can
download necessary commands to firmware during manufacturing mode tests.

Signed-off-by: Xinming <huxm@marvell.com>
Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
---
v4: Used cfg80211 testmode interface instead of wext in 2/2 patch.(Kalle Valo)
v3: Add "select WIRELESS_EXT" in Kconfig to resolve kbuild test robot errors.
    WEXT_PRIV seems to have a dependency with WIRELESS_EXT.
v2: 1) Sequence of these two patches are changed to resolve compilation
    error seen if only 1/2 is applied.
    2) Add "select WEXT_PRIV" in Kconfig to resolve warnings reported by
    kbuild test robot.
---
 drivers/net/wireless/marvell/mwifiex/cfg80211.c | 83 +++++++++++++++++++++++++
 1 file changed, 83 insertions(+)

diff --git a/drivers/net/wireless/marvell/mwifiex/cfg80211.c b/drivers/net/wireless/marvell/mwifiex/cfg80211.c
index 235fb39..86b31b1 100644
--- a/drivers/net/wireless/marvell/mwifiex/cfg80211.c
+++ b/drivers/net/wireless/marvell/mwifiex/cfg80211.c
@@ -3919,6 +3919,88 @@ static int mwifiex_cfg80211_get_channel(struct wiphy *wiphy,
 	return ret;
 }
 
+#ifdef CONFIG_NL80211_TESTMODE
+
+enum mwifiex_tm_attr {
+	__MWIFIEX_TM_ATTR_INVALID	= 0,
+	MWIFIEX_TM_ATTR_CMD		= 1,
+	MWIFIEX_TM_ATTR_DATA		= 2,
+
+	/* keep last */
+	__MWIFIEX_TM_ATTR_AFTER_LAST,
+	MWIFIEX_TM_ATTR_MAX		= __MWIFIEX_TM_ATTR_AFTER_LAST - 1,
+};
+
+static const struct nla_policy mwifiex_tm_policy[MWIFIEX_TM_ATTR_MAX + 1] = {
+	[MWIFIEX_TM_ATTR_CMD]		= { .type = NLA_U32 },
+	[MWIFIEX_TM_ATTR_DATA]		= { .type = NLA_BINARY,
+					    .len = MWIFIEX_SIZE_OF_CMD_BUFFER },
+};
+
+enum mwifiex_tm_cmd {
+	MWIFIEX_TM_CMD_HOSTCMD	= 0,
+};
+
+int mwifiex_tm_cmd(struct wiphy *wiphy, struct wireless_dev *wdev,
+		   void *data, int len)
+{
+	struct mwifiex_private *priv = mwifiex_netdev_get_priv(wdev->netdev);
+	struct mwifiex_ds_misc_cmd *hostcmd;
+	struct nlattr *tb[MWIFIEX_TM_ATTR_MAX + 1];
+	struct mwifiex_adapter *adapter;
+	struct sk_buff *skb;
+	int err;
+
+	if (!priv)
+		return -EINVAL;
+	adapter = priv->adapter;
+
+	err = nla_parse(tb, MWIFIEX_TM_ATTR_MAX, data, len,
+			mwifiex_tm_policy);
+	if (err)
+		return err;
+
+	if (!tb[MWIFIEX_TM_ATTR_CMD])
+		return -EINVAL;
+
+	switch (nla_get_u32(tb[MWIFIEX_TM_ATTR_CMD])) {
+	case MWIFIEX_TM_CMD_HOSTCMD:
+		if (!tb[MWIFIEX_TM_ATTR_DATA])
+			return -EINVAL;
+
+		hostcmd = kzalloc(sizeof(*hostcmd), GFP_KERNEL);
+		if (!hostcmd)
+			return -ENOMEM;
+
+		hostcmd->len = nla_len(tb[MWIFIEX_TM_ATTR_DATA]);
+		memcpy(hostcmd->cmd, nla_data(tb[MWIFIEX_TM_ATTR_DATA]),
+		       hostcmd->len);
+
+		if (mwifiex_send_cmd(priv, 0, 0, 0, hostcmd, true)) {
+			dev_err(priv->adapter->dev, "Failed to process hostcmd\n");
+			return -EFAULT;
+		}
+
+		/* process hostcmd response*/
+		skb = cfg80211_testmode_alloc_reply_skb(wiphy, hostcmd->len);
+		if (!skb)
+			return -ENOMEM;
+		err = nla_put(skb, MWIFIEX_TM_ATTR_DATA,
+			      hostcmd->len, hostcmd->cmd);
+		if (err) {
+			kfree_skb(skb);
+			return -EMSGSIZE;
+		}
+
+		err = cfg80211_testmode_reply(skb);
+		kfree(hostcmd);
+		return err;
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+#endif
+
 static int
 mwifiex_cfg80211_start_radar_detection(struct wiphy *wiphy,
 				       struct net_device *dev,
@@ -4031,6 +4113,7 @@ static struct cfg80211_ops mwifiex_cfg80211_ops = {
 	.tdls_cancel_channel_switch = mwifiex_cfg80211_tdls_cancel_chan_switch,
 	.add_station = mwifiex_cfg80211_add_station,
 	.change_station = mwifiex_cfg80211_change_station,
+	CFG80211_TESTMODE_CMD(mwifiex_tm_cmd)
 	.get_channel = mwifiex_cfg80211_get_channel,
 	.start_radar_detection = mwifiex_cfg80211_start_radar_detection,
 	.channel_switch = mwifiex_cfg80211_channel_switch,
-- 
1.9.1